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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 25th Jan 2018, 12:19 pm   #41
Rubberfingers
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Default Re: Analogue Electricity Meters.

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I was involved with a company that developed a split CT that fitted within the meter, so that if a bypass was added, a mercury coulomb meter would register the imbalance.
Presumably, If anyone had a mis-wired plug with N and E crossed, the mercury coloumb meter would record an imbalance and they would be under suspicion of meter fraud?
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Old 25th Jan 2018, 3:48 pm   #42
AC/HL
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Default Re: Analogue Electricity Meters.

It's inconceivable that steps wouldn't have been taken to detect fraud, once it became common knowledge.
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Old 25th Jan 2018, 3:59 pm   #43
julie_m
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Default Re: Analogue Electricity Meters.

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Originally Posted by Rubberfingers View Post
Presumably, If anyone had a mis-wired plug with N and E crossed, the mercury coloumb meter would record an imbalance and they would be under suspicion of meter fraud?
There used to be a popular urban legend about that. But as long as the meter is only sensing the current in the live side, and not relying on there being an equal current in the neutral, it ought still to count every Joule.

Of course, it wouldn't work in an RCD-protected installation, anyway .....
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